"Before the 2006 Michigan gubernatorial primary, three political scientists isolated a group of voters and mailed them copies of their voting histories, listing the elections in which they participated and those they missed. Included were their neighbors’ voting histories, too, along with a warning: after the polls closed, everyone would get an updated set. After the primary, the academics examined the voter rolls and were startled by the potency of peer pressure as a motivational tool. The mailer was 10 times better at turning nonvoters into voters than the typical piece of pre-election mail whose effectiveness has ever been measured."
"Yale political scientists Alan Gerber and Donald Green conducted a study testing the relative effectiveness of basic political tools. As the 1998 elections approached, Gerber and Green partnered with the League of Women Voters to split 30,000 New Haven voters into four groups. Some received an oversize postcard encouraging them to vote, others the same message via a phone call or in-person visit. One control group received no contact whatsoever. After the election, Gerber and Green examined Connecticut records to see who actually voted. The in-person canvass yielded turnout 9.8 percent higher than for voters who were not contacted. Each piece of mail led to a turnout increase of only 0.6 percent. Telephone calls, Gerber and Green concluded, had no effect at all."
Read about "How Behavioral Science is Remaking Politics" in the NYT.